If this was my Little Reef Rockpool I think I would aiming for at least 5 nitrates, most people know I don't really test but I do read a lot and sort of understand how stuff works.
The coral will be using the nitrates to an extent as well, not a fan of ln systems but I don't have to run your tanks!
But I did write that it depends on the tank
This big tank is pretty stable and the nutrients change slowly( and I like to test a lot ). So for this tank aiming for 1-2 ppm is quite safe actually.
/ David